超高压处理对毛栓菌多酚氧化酶的影响  

Effect of High Pressure Processing on Polyphenol Oxidase from Trametes Trogii

作　　者：陈小强[1,2] 章银军[3] 张士康[1] 励建荣[2,4] 金建昌[5] 郑娜[6] 杨秀芳[1] 

机构地区：[1]中华全国供销合作总社杭州茶叶研究院,浙江杭州310016 [2]浙江工商大学食品与生物工程学院,浙江杭州310035 [3]浙江工业大学生物与环境工程学院,浙江杭州310014 [4]渤海大学,辽宁锦州121013 [5]浙江树人大学生物与环境工程学院,浙江杭州310015 [6]浙江大学化学工程联合国家重点实验室,浙江杭州310027

出　　处：《高压物理学报》2012年第2期235-240,共6页Chinese Journal of High Pressure Physics

基　　金：科技部农业科技成果转化基金(2010GB24420685);中华全国供销合作总社杭州茶叶研究院资助项目(2011YJ03)

摘　　要：以茶多酚为底物,测定毛栓菌多酚氧化酶(Polyphenol Oxidase,PPO)活性的最适pH值为5.0、最适底物浓度为4mg/mL,经100、300和500MPa超高压处理10min的PPO酶活分别是未处理的93%、87%和86%。圆二色谱和高效液相凝胶渗透色谱分析结果显示,100和300MPa压力处理PPO的圆二色谱位于190～210nm的正Cotton效应峰分别产生"褶皱"和"分蘖";高效液相凝胶渗透色谱中的第一时间出峰组分(即最大分子量组分)的保留时间由6.678min分别提前至1.514和2.296min。500MPa压力处理PPO的圆二色谱和高效液相凝胶渗透色谱与对照相比差异更加显著,其圆二色谱中只有一个正Cotton效应峰;其高效液相凝胶渗透色谱中主要组分的色谱峰面积减小(即280nm的响应值降低)。不同压力处理的PPO的圆二色谱与高效液相凝胶渗透色谱图的差异程度具有对应关系。The activity of polyphenol oxidase（PPO） produced from Trametes Trogii was determined through using tea polyphenols as substrate.The pH value and the substrate concentration of strongest activity of PPO are 5.0 and 4 mg/mL,respectively.The activity of PPO processed by ultrahigh pressure of 100,300 and 500 MPa for 10 min accounted for 93%,87% and 86% of that of untreated one.The CD spectra of PPO processed by 100 and 300 MPa pressure respectively displayed folding shape and tillering shape of Cotton effect peak located in 190-210 nm,while the retention time of the first peak fraction（i.e.,the maximum molecular weight fraction） of the two processed PPO on HPGPC profiles were advanced to 1.514 and 2.296 min,respectively from 6.678 min.Compared with control,CD spectrum and HPGPC of PPO treaded by 500 MPa showed more significant difference with only one positive Cotton effect peaks on CD spectra and reduced peak area of main components on HPGPC profiles（ie,the response value of 280 nm decreased）.The disparity of CD and HPGPC of PPO treated by various UHPP showed the corresponding difference in the degree

关 键 词：超高压处理 多酚氧化酶 圆二色光谱 高效液相凝胶渗透色谱 毛栓菌 

分 类 号：O521.9[理学—高压高温物理]